import datetime
from django.contrib.gis.db import models
from django.conf import settings
from django.contrib.sitemaps import Sitemap
from django.contrib.syndication.views import Feed
from PIL import Image


import markdown
from taggit.managers import TaggableManager
from locations.models import Location
from blog.models import Entry
from photos.models import PhotoGallery


def get_upload_path(self, filename):
    return "images/guide-images/%s/%s" % (datetime.datetime.today().strftime("%Y"), filename)


def get_tn_path(self, filename):
    return "images/guide-thumbnail/%s/%s" % (datetime.datetime.today().strftime("%Y"), filename)


def image_url_replace(str):
    str = str.replace('[[base_url]]', settings.IMAGES_URL)
    return str


def markdown_processor(md):
    return markdown.markdown(md, ['footnotes'], safe_mode=False)


class Guide(models.Model):
    title = models.CharField(max_length=200)
    slug = models.SlugField(unique_for_date='pub_date')
    entry = models.ForeignKey(Entry, null=True, blank=True)
    body_html = models.TextField(blank=True)
    body_markdown = models.TextField()
    dek = models.TextField(null=True, blank=True)
    pub_date = models.DateTimeField('Date published')
    location = models.ForeignKey(Location, null=True, blank=True)
    PUB_STATUS = (
        (0, 'Draft'),
        (1, 'Published'),
    )
    status = models.IntegerField(choices=PUB_STATUS, default=0)
    photo_gallery = models.ForeignKey(PhotoGallery, blank=True, null=True, verbose_name='photo set')
    meta_description = models.CharField(max_length=256, null=True, blank=True)
    TEMPLATES = (
        (0, 'single'),
        (1, 'double'),
        (2, 'single-dark'),
        (3, 'double-dark'),
    )
    template_name = models.IntegerField(choices=TEMPLATES, default=0)
    tags = TaggableManager(blank=True)
    image = models.FileField(upload_to=get_upload_path, null=True, blank=True)
    thumbnail = models.FileField(upload_to=get_tn_path, null=True, blank=True)

    @property
    def longitude(self):
        '''Get the site's longitude.'''
        return self.point.x

    @property
    def latitude(self):
        '''Get the site's latitude.'''
        return self.point.y

    class Meta:
        ordering = ('-pub_date',)
        get_latest_by = 'pub_date'
        verbose_name_plural = 'entries'

    def __unicode__(self):
        return self.title

    def get_absolute_url(self):
        if self.location:
            return "/travel-guide/location/%s/%s/" % (self.location.slug, self.slug)
        else:
            return "/travel-guide/%s/" % (self.slug)

    def get_thumbnail_url(self):
        image_dir, img = self.thumbnail.url.split('guide-thumbnail/')[1].split('/')
        return '%sguide-thumbnail/%s/%s' % (settings.IMAGES_URL, image_dir, img)

    def get_image_url(self):
        image_dir, img = self.image.url.split('guide-images/')[1].split('/')
        return '%sguide-images/%s/%s' % (settings.IMAGES_URL, image_dir, img)

    def save(self):
        #get image dimensions
        if self.image:
            img = Image.open(self.image)
            self.image_width, self.image_height = img.size
        #same for thumb
        img = Image.open(self.thumbnail)
        self.thumb_width, self.thumb_height = img.size
        md = image_url_replace(self.body_markdown)
        #run markdown
        self.body_html = markdown_processor(md)
        self.dek = markdown.markdown(self.dek, safe_mode=False)
        super(Guide, self).save()


class GuideSitemap(Sitemap):
    changefreq = "never"
    priority = 1.0

    def items(self):
        return Entry.objects.filter(status=1)

    def lastmod(self, obj):
        return obj.pub_date


class GuideFull(Feed):
    title = "Luxagraf: Topographical Writings"
    link = "/writing/"
    description = "Latest postings to luxagraf.net"
    description_template = 'feeds/blog_description.html'

    def items(self):
        return Entry.objects.filter(status__exact=1).order_by('-pub_date')[:10]


#from django.dispatch import dispatcher
#from django.db.models import signals

#signals.post_save.connect(update_recent, sender=Entry)